c-axis optical sum rule in the Josephson-coupled vortex state
Wonkee Kim, J. P. Carbotte
DOI 10.1103/PhysRevB.64.104501 · Physical Review B
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Abstract
Observed violations of the c-axis optical sum rule can give important information on deviations from in-plane Fermi liquid behavior and on the nature of interlayer coupling between adjacent copper oxide planes. Application of a magnetic field perpendicular to these planes is another way to probe in-plane dynamics. We find that the optical sum rule is considerably modified in the presence of the c-axis magnetic field. Interlayer correlation of pancake vortices is involved in the sum-rule modification; however, details of the vortex distribution in the plane are less important.
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